march and july set u.s. records as the hottest of all-time. >> number seven, western wildfires. >> oh, my god. smoke in the air. >> heat waves fueled wildfires that charred the west. colorado experienced two of the state's largest and most destrublthive fires ever. >> number six, the duratio in june. >> it began in iowa, moves through indiana, ohio, and into washington, d.c. a fast-moving, long-lasting, violent thunderstorm complex. >> after charging 800 miles, 22 were dead and 5 million were without power. >> number five, the dallas 22. there's an old myth that tornadoes don't hit big cities. april 3rd proved otherwise when twisters hilt dallas. >> it was scary. it was so scary. it reminds you of the "wizard of oz." >> in all, 22 tornadoes cause nearly a billion of damage within 24 hours. >> number four, deadliest tornatorna tornado tornadoes. tornadoes took up three spots in the top ten countdown, but this event was the deadliest. march 2nd and 3rd, 70 tornadoes killed 40 people in the u.s. >> number three